Burglar-alarm lock and door-bell.



L. F. LOHEENS.

BURGLAR ALARM LOCK AND DOOR BELL.

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1,296,982. I Patented Mar. 11,1919.

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r mums PEYERS c LOUIS F. LOHRENS, OF CHICAGO, TLLINOIS.

BURGLARFALARM LOCK Ann DOOR-BELL.

Specification of Letters Patent.

Patented Mar. 11, 1919.

Application filed'April 1, 1916, Serial No. 88,196. Renewed July 22. 1918. Serial No. 246,233.

To all whom it may.c0ncern.'-

Be it known that I, LOUIS F. LOHRENS, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Burglar-Alarm Locks and Door-Bells, of which the following is a specification.

"My invention relates to improvements in burglar alarm locks and more particularly to such an alarm arranged to cooperate with a door guard of the slotted hasp and latch type, such as is commonly used for the purpose of providing a lock for holding the door closed, and also a lockwhich will permit the door to be opened a few inches'but will prevent it from being further opened.

Theprincipal object of my invention is to provide in combination with such a lock an alarm signal which will be actuated upon pressure being exerted upon the door, sounding an audible alarm, it being immaterial whether the door be bolted in its closed position or locked in its partially open position. Another object of my invention is to provide an alarm in association with the hasp member of such a guard, the two button latch commonly employed with guards of this character remaining unchanged. In my apparatus the latch member, this part being usually attached to the door, remains unal tered, whereas the hasp member secured to the casing is associated with the alarm bell so that when pressure is exerted thereon it is free to move a'slight distance before coming against a stop preventing further movement. This slight movement resulting from pres sure being exerted on the door, as in an attempt to open it, will actuate the alarm.

Asa further refinement of my invention I have provided in connection with the audible alarm a door button positioned on the outside of the casing taking the place of the usual door bell button, pressure upon which will actuate the alarm. This enables the audible signal to serve the double function of announcing the presence ofa caller and also sounding an alarm should an unauthorized person attempt to open the door.

In the drawings wherein I'have illustrated a preferred embodiment of my invention; Figure 1. is a horizontal sectional view through a door and door casing showing my improved apparatus attachedthereto, the

position occupied by "the door and hasp, be-

ing shown in dotted lines when the door is open. V

Fig. 2 is a side elevation of the hasp and signal showing the hasp broken away'at its pivot to illustrate the lost motion connection with its bracket.

Fig. 3 is a front elevation of the hasp and alarm as shown in Fig. '1. T

Fig. is a front elevationof thealarm mechanism showing the cover bell removed.

5 is a vertical sectional view through the alarm mechanism at the rear of the gear train showingthe control cam by means of which the alarm is permitted to ring a predetermined length of time after once being actuated. V V

Fig. 6 is a'vertical sectional view on the line 66 of Fig; 4:, and;

Fig.7 is a perspective view of the alarm V face a rotatable button, such as is commonly employed with the ordinary type of guards of this character.

Mounted upon the jamb of the door adjacent the latch 12 is a plate 15 which overlies the molding 16 and is suitably secured thereto by means of screws 17. This plate is looped asat 1S and then turned outwardly to form a pivotal support, as at 19, for the hasp, the plate then being bent back upon itself, as at 20, to engage the inner face of the jamb of the door and provide an additional attachment member. 7 The plate 15 at the point where it'is doubled back upon itself, is cut away, as at 21, to receive the head ,13 of. the latch when the door isblos'ed, the

hasp 22 at that time overlying the outer face of thelatch 12 in position for engagement through its slotted opening 23rwith the rotatable button, or thumbbolt 14. V The cutting away, as at 21, of the plate 15, provides upper and lowerarms 2 1 to which the hasp is pivoted. Instead'of providingcircularapertures in the ends of the arms 24 in which to the hasp with respect to its mountingplate V V on lines perpendicular to the casing.

On ;a downwardly extending wing 28 of the plate '15 I have mounted an alarm'mechanism comprising a base part 29 and bell 30.

The bell is carriedion the outer end of a central spindle 31 to which is secured one end of the coil spring 32. Throughthe-train of mechanism indicated as at 33, the power stored bythe spring is transmitted to anescapement pawl 3a which in .turnactuates an arm 35"on the end of which is secured the hammer 36. The spring is wound by rota- .tion'of the bell 30, a suitable ratchet 37 being providedto hold the spring in its wound condition. i V 7 'Actuation of the :bell is secured through a reciprocable plunger 38 which 'is guidedly I vheld in an upstanding lug 39" carried by the plate and projects intothe base part 29of the bell. Apin e0 carried'by the lower end of the plunger 38 engages the underside of the hammer arm .sothat when in its raised position it lQQkS the'h'ammer against movefment and consequently: prevents ringing of the alarm. i Downward movement ofgthe plunger toward theaxis of the bell releases the hammer and permits the escapement pawl 34: to vibratethe hammer.

7 .42, of the lower hasp pivot pin 26. A shoul The upper end of the reciprocable plunger 38 .is beveled off, as at 41, for engage.- ment with the downwardly projecting end lder 43 is provided'near thelower end of the pin 26 to prevent itsvertica'l movement 7 within its bearing slot 27; Obviously, outward movement of the pin 26 .such'aswould result from an outward movement of the hasp due to an efiort .to open the door will depress the cam shaped end 5L1 of the plunger'38 thus permitting the bell tosound its alarm.

' Inorder that the alarm may not be terminated immediately on cessation of pres sure I have provided a mechanism by means of which the alarm once initiated will continue to ring fora predetermined length 'ofltime; This comprises a'leaf spring normally tending to pull the rod into hammer release position and riveted to the casing as at 51 andlextending in an arc to a point where its further end is connected -to,;the lower end of the plunger :38 intermediate its ends thespring bent putwardly to form a cam like *;S l1OI1 l( le 1"; 52

which projects into the path of any one of a plurality of arms ;3carried by thespinl- 1 h oute G ld Of these arms (in r to the particular emhodiment shown I have illustrated three'arms) is provided a nubfi l,

which when it engages with the cam surface ,52 forces the 'springgoutwardly and conseyguently raises the plunger stopping gthebell. 0n h dep s i p he n ung ne de t t a empn op nihedq r' ehammewn sa casmermi tin eme heni ato elsmm is operates this; lenses 1 r a soq at i wit thshasp '53 past the cam surface 52, the bell continuing to ring until the nextsucc'eeding cam arm 54 comes into engagement with the cam surface 52 and forces'the plunger upwardly and outwardly again locking the alarm mechanism;

In order that this same alarm mechanism 'may be used as a manually operable door bell, this association being vparticularly valuable in connection with apartment kitchen doors and the'like, whereexpense ofinstallation is an important factor, Ivhave provided a plunger which projects outwardly through an openingin the frame ofthe door engagement with a notch-.66 cut inthe alarm actuating plunger, 38. Pressure on the buti P n r 0 a a nst th l wer s e ,o the notch66 in the alarm'actuating plunger,

thus moving it downwardly and initiating a signal. i r j r i Whereas I have illustrated and describeda single-embodiment of invention it will .beobvious that various changes may he made .ton 61 thrws the wedgeshaped lend 6f5 of therein without departing from the spirit pf the invention or thescopeof theappended claims.

7 Having described invention, what I claim is V 1. The combination-wi th a door andyits ing o a d r ard qmpri i g ha p, a latch on the door for association with'the hasp to lock the door in either closed or partially pe P itbmmea m'mm ntingth hasp carried by thecasing topermitlimited b d y m e en a el a recta -mereen he ots nal, andmean a uated by the bodily movem tiate the signal.

casingof a door guard comprising a'lhasp association with the h asp to lock thefldoor in either closed? or, partially open ip ition, ea fo un in the ha h t perm limited bodily movement as'well as pivotal m t h o a spring mo hell; a release for said spring motor, and means 1 f t ha p min loo e m i a lnwi h' k 60 eand it r H i 1115 1 a r d y th as n x eb oathe oo for" r p ted by he i y i ovem nt fih ba p r to actuate the'release.

i The comb t e th 'de i g of a doo guard compr ng a been ar ed .by h easi g, a la ch 9 th? ido 0 lQQl d i eithe cl ed or P321217 1 enipqsllii ii i 7 it i therein, a pivot pin carried by the hasp and engaging the said opening, the pin being smaller than the opening to permit relative movement therein, a signal, and means actuated by the bodily movement of the pin within the opening to initiate the signal.

4:. The combination with a door and its casing of a door guard comprising a hasp carried by the casing, a latch on the door for association with the hasp to lock the door in either closed or partially open position,

a support for the hasp, having a slot therein extending perpendicularly to the door frame, a pivot pin carried by the hasp and engaging the. slot, a signal, and means actuated by the bodily outward movement of the pin within the slot to initiate the signal.

5. The combination in a door guard comprising a slotted hasp for attachmentto a door casing and a latch for attachment to a 20 door, of a pivotal mounting for said hasp permitting free pivotal movement when not engaged by the latch and a slight limited bodily movement in "a plane substantially perpendicular to the plane occupied" by the 25 door when closed, and means actuated by the bodily movement of the hasp to initiate a signal. 7

In testimony whereof I hereunto set my hand in the presence of'two subscribing wit- 0 nesses.

LOUIS F. LOHRENS.

In the presence of STANLEY W. Coon, MARY F. ALLEN.

Gopies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents, Washington, D. 0. 

